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Page Title: Half-Split Method of Troubleshooting
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Figure 7-20.  How to Troubleshoot - Diagram
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TM-9-254 Gearcase Transfer M548 M548A1 (
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Half-Split Method of Troubleshooting (cont)
TM 9-254 7-12. Troubleshooting with the Technical Manual - Continued (3) Do the checkout procedure in Volume I, Chapter 2 from the beginning until you find a fault symptom. (4) When  a  fault  symptom  is  found,  go  to  the  chapter  noted  and  follow  the  maintenance  procedure  given there.    If  you  already  know  the  fault  symptom,  look  at  the  fault  symptom  index  in  Chapter  3  of  this volume. (5) After the bad part has been repaired or replaced, do the checkout procedure in Chapter 2 again.  This is to make sure all fault symptoms have been corrected. (6) If all the faults are now corrected, do the remaining maintenance tasks on DA Form 2404. (7) Do the final inspection given in Volume II, Chapter 5. (8) The job is over and the good assembly is sent back to service. (9) If all faults were not corrected after step 5, the bad assembly is sent to the depot for repair. 7-13. Half-Split Method of Troubleshooting. Half-splitting  is  a  technique  used  in  trouble  shooting  which  reduces  the  average  number  of  measurements  needed  to isolate the faulty stage or component.  Consider the eight stage path shown in figure 7-21 and the technique explained in the following paragraphs Figure 7-21.  Eight Stage Block Diagram (1) The first measurement using half-splitting would be made at point E (the middle of the faulty path).  If the signal is okay at point E the path to the left of point E is good and the problem lies between points E and I.  Thus one measurement has reduced the size of the faulty path by one-half (half-splitting). (2) The   next   measurement   would   be   made   at   point   G   again   splitting   the   faulty   path   in   half.      If   the measurement  at  point  G  is  bad  (no  signal)  the  next  measurement  would  be  made  at  point  F.    This method of splitting a faulty path in half is continued until the faulty stage is isolated. 7-24

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